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24 Cards in this Set

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scientific method

-approach to answer questions


-objective observation


-hypothesis formulation


-hypothesis testing by experimentation


-analysis and conclusions

Indepedent variable

on x axis

dependent variable

on y axis

null hypothesis

states that X has no effect on Y

hypothesis testing by experimentation

-experimental variable


- -independent and dependent


control group


-control oustside variable


evolution

-change in the genetic make up of a population over time

population

-is a group of cospecies (members of same species) tha tlive inteh same geographic area and interbreed

to be members of same species have to

-be able to interbreed and produce fertile offspring

natural selection

-main mechanism that drives evolution


-process in which individuals with certain traits survive and reproduce at higher rates than individuals lacking those traits

adaptations

-inherited traits that enhance survival and reproduction in a specific environment

speciation

-when populations are reproductively isolated from one another over long spans of time it is possible that the population diverge, becoming so genetically different thtat they cant reproduce

organic

-the molecules are based on chiains or rings of carbon atoms

macromolecules

-large molecule


-the molecule has high molecule weight


-usually used to describe polymers whihc biomolecules comprise the structure and function of life

carbs

sugars and starches

lipids

-fats, waxes, oils, steroids

proteins

structural molecules and enzymes

nucleic acids

DNA, RNA, ATP

monomers

-single units


-may eist on their own or a part of a polymer

polymer

-long molecule consisting of many similar of identical building blocks(monomers) linked by covalent bonds

covalent bonds that joins monomers

-is formed through a reaction called dehydration or condensation

dehydration

-water lost


-removal of two hydrogen atoms and an oxygen atom between two molecules

hydrolysis

-opposite of dehydration


-breaks the covalent bond between two monmers by addeing a water

general chemical formula for carbs

-(CH2O)lil n

lil n

can be any number